.PHONY = all clean

all:
	@(cd string1; make)
	@(cd string2; make)
	@(cd string3; make)
	@(cd string4; make)
	@(cd string5; make)

clean:
	@(cd string1; make clean)
	@(cd string2; make clean)
	@(cd string3; make clean)
	@(cd string4; make clean)
	@(cd string5; make clean)
